# All Questions

282 questions with no upvoted or accepted answers
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191 views

### Is my colleague happy with me?

So I graduated last year with a chemical degree and I started working in a lab. I'm still pretty nervous about making mistakes, so when I had to prepare a tricky experimental setup, I wrote down what ...
564 views

### Coloured dot cipher

I, as a curious being, stumbled upon a page which had a hidden dot cipher in it. Part of the console states: [...] we left you a little message in the dots of the footer (Source: segment.com) The ...
671 views

### Need help with a cipher

I am trying to figure out a cipher I think I found in a book from 1982 and it's a 36 year old mystery we are trying to solve (I will reveal the book if this turns out to be something so everyone can ...
59 views

### Ernie and the Equi-area Tetrahedra

I enjoy spending time with Ernie when he is 'pottering' in his workshop. It is a large open-plan area filled with soldering-stations and oscilloscopes, lathes and milling machines, band-saws and drill-...
207 views

### Toilet Paper Math?

Ben stared in dismay at the hundreds of bits of paper scattered around his room. This was going to be a lot of work. His brother waltzed in and picked up a larger sheet. "Watchya doin' writin' ...
335 views

### A splash of Minecraft?

I was playing Minecraft the other day and came across a beautiful splash message. Subsequently, I was inspired to create a puzzle for it. Svir, look out below! Shorty's slang stays surprisingly stout....
224 views

### One vs many. Can white force a draw?

On an infinite chessboard there's a single white king and N black kings. The nearest black king must be K moves away from the white king. Given N, white dictates the value of (finite) K, then black ...
129 views

### What is the name of this hook-like puzzle?

I don't know the name of this puzzle but I'd like to be able to google it See the attached photo. (I've already search on G puzzle and Hook puzzle without any luck).
154 views

### Dashed number cipher

74393-493-71335-34393-1-83457102-377-13-57111-40129-3447-1-00-420-50371335-1-93057104-377-13-207-0340-737 Disclaimer: This cipher is not mine, but it was interesting and I managed to solve it. Credit:...
289 views

### A slightly different type of Sudoku puzzle

The following image shows two valid Sudokus. The first was copied verbatim off Wikipedia, and the second was obtained by rotating 90 degrees. Any two distinct valid Sudokus must differ in at least ...
265 views

### I have no idea what this means

Hmm? What's this? A room. Great. Great. As if the guards don't know I'm claustrophobic. There's a strange text on the wall: Ribna tifmagta resru, sunte no, renler sludted dtednsehnun rurdal slutakdal ...
259 views

### Again, the scientific one!

I am looking for an answer that consists of two parts(____ ____). The task is to somehow make sense of this word grid below with the help of the clue. Hint Hint2
193 views

### We name everything

Hint: We name everything. And then I mean everything. E V E R Y T H I N G. Hard to sum it all up. Well, have a go at it: 13/59-21/18 11/36/15/19(2)/14 12/1/19/37 17/17(2)/53/36(2)/31/43 32/...
215 views

354 views

### Around The World

It's White to move and win against Black. Black plays optimally. Have fun! Oleg Pervakov and Karen Sumbatian, Shakmaty v SSSR 1990 P.S.-To me, it’s crazy that the title hasn’t been taken yet! Hint:
774 views

### Number Sequence Series-Question 7

This is a series of questions that are created by me. Here is question 7: (23)，(55)，(155)，(1255)，？，？，(56139611) I will give a hint to you guys in one month if nobody can solve it.
234 views

### Numerical puzzle

A friend of mine sent me this puzzle, to solve it you need to use: 1) basic arithmetic operations. 2) Multiple numeral systems.
250 views

### Will you win the game?

You play a gambling game. On 100 folded pieces of papers are written 100 different values. You cannot see the numbers written on the folded pieces of paper, which are grouped in a pile. You pay 10 ...
175 views

### Problem #NaN Fodder/Output

Inspired by Ben Franks' Input/Output Problem #1 and the others in the series Hint: Knowledge required is
84 views

### How to create a puzzle from a pre-existing, fixed data source?

Examples of what I mean: Instructions lead puzzlers to a library where the names of donors are inscribed on bricks out front. Along with some piece of information that is given to them on a piece of ...
149 views

### Honda tutu del moto - Words which say something

You find a paper lying on the sand. Does it mean something ... an imgur maze, maybe ? Cultures reserve glasses. Twin economists migrates with tails in a fine risk. Conglomerate ... voo dun saga waga ...
197 views

### What are these encrypted Starfield tweets saying?

There are a lot of rumors about Bethesda Softworks and/or Bethesda Game Studios announcing a new game at E3 this year, or even on May 14th (source). A key in this mystery is the trademark 'Starfield'. ...
251 views

### Can anyone decipher this?

My friend just sent me this 5627 4654554 With a keyword of 'Digital' Which is apparently going to make this have some sense: At first, it's difficult to understand. But once you read down, you ...
238 views

### The search for dracula - a puzzle

Me and some friends are playing a roleplay about Dracula in the modern age. Last night, we received the following puzzle from the game-master. (7 1 1 1 1) (17 8 8 8 8) (4313 2755) With the ...
208 views

### Mega-puzzle of many number puzzles: Nikoli Octathlon

This puzzle has been my Moby Dick of puzzles for so long. It's from MellowMelon's old puzzle site and is a Nikoli-based megapuzzle with eight sub-puzzles. I'm copying the puzzle image from there so as ...
260 views

### Answer to the question: "Who Wins?"

Crié ala caleverti miku'ilatmo doci pramilerfu Hint: Non-Youtube description of video contents (for accessibility/posterity purposes):
277 views

### Here's the song, now tell me the title!

You ever have it happen where you know how a song goes, but you forget its title? I've heard you guys are good at figuring stuff out for free, so I'll just drop some notes here and let you guys do ...
131 views

### Slow & Fast drivers

Let us define "fastness" as a characteristic of how fast/agressive a driver is. One aspect of this is the (maximum) time between a traffic light turning red and the driver deciding they have ...
182 views

### An Assortment of Letters

Can you figure out how I've split the below letters into their groups? Group 1 Group 2 D H L S F P T Y Group 1 Group 2 Group 3 C D H J N P V W Y L T M S B R Group 1 Group 2 Group 3 Group 4 Group ...
341 views

### Rare but Abundant in Hill and Hole

I am uncommon, But a worthy goal. Rare but abundant In hill and hole. Who am I? You may already know the answer, so the task is not to answer the riddle per se, but to solve the following 'What is a ...
253 views

### Patterns - they're everywhere!

You wake up in a room (again) that has two floors, Both have 3 puzzles. In order to escape, You have to find every answer in this order: Red Yellow Green Cyan Navy Pink and combine it together (eg if ...
225 views

### Code found written in chalk: "JSMYCTLYCTJCBEXD19"

The code I found on the sidewalk in chalk at my local courthouse is JSMYCTLYCTJCBEXD19 I have had trouble identifying the code type as well as the deciphered message. Any and all suggestions/help ...
301 views

### Fill in a 5x5 multiplicative magic square

Let's say you fill in a 5 by 5 square with the numbers 1, 2, ..., 25. Is there a way to fill it so that the product of the first row is equal to the product of the first column, the product of the ...
176 views

### The Author of a Note

After finding this note, I've pretty much gone to the ends of the earth to find the author's name. Maybe you can help me? Suppose I want my room to be a weird color. Something uncommon, like purple. ...
120 views

### The Mantra Riddle

A sentence that can never fail A broken foot without its tail Almost there... reverse one sound By turns mundane and quite profound. The mantra is your compass then Your watch to know exactly when It ...
176 views

### There are six of them today

All six are different. If we sort by small to large from the beginning, the third, fourth and sixth are the same. It was designed by the sculptor. Society over the smallest a drawing has been placed ...
133 views

### What is poetry, What is time, What is rhythm, What is rhyme?

The sun that hides underneath his belt, a new horizon, that none shall melt. What is a bird that never flies, or a heart that never dies? Can a man be saved by grace alone, or runs a river that cries. ...
201 views

### Infected Cylinder and Torus

A variant of the well known Infected Checkerboard problem. If we've a 𝑛x𝑛 square, then we fold it along top and bottom row to form a cylinder. A cell in this cylinder becomes infected if at least ...
524 views

### Help With Dan Brown's Unsolved Puzzle

Dan Brown has an unsolved message on his website https://danbrown.com/ There are hidden symbols on 5 JPG images and 5 PNG images that overlay the JPGs. JPG Images: int1.bg.jpg, int2.bg.jpg, int3.bg....
131 views

### The plant king's story

I am here tonight to pledge a hero's deed on knife's edge his kingdom's name is a plant find it in places moisture scant. The castle on the verge to fall, due to a flock of livings small. It was left ...
115 views

### Designing a new type of twisty puzzle

Recently, I was fiddling with my Rubik's cube and tried scrambling it only using R and U moves. I then tried to solve it using only R and U moves. I didn't use any cube rotations. It was an ...
87 views

### Methods to produce solvable deals in Klondike-solitaire?

About 20% of Klondike-solitaire deals are not solvable. My question is what are the best methods to produce only solvable deals? I thought about two options: Deal a random permutation, then try to ...
143 views

### Ideas on spatial puzzles for a city walk

Background. With the relaxation of covid-related restrictions, there was a need for intelligent city walks. Walk here is a moving between city objects by a certain (deterministic/stochastic) route. I ...
181 views

### The madness of a master

It was midnight. Mr. Holmes was suffering from abdominal pain, shortness of breath, pain in the bones, skin lesions and whatnot? So in this condition, why would Mr. Holmes drive to Brazilian Churches, ...
295 views

### What type of puzzles are the statue puzzles in Super Lucky's Tale, and what method should be used for solving them?

This question is about a set of puzzles in the video game "Super Lucky's Tale" (as well as its Nintendo Switch remake "New Super Lucky's Tale"). They are known as statue puzzles as ...
117 views

### Good family relationship

Mr.K's message: It's a beautiful day outside! Geese are flying. Remember that my favorite seafood is squid? It's best served with Java waterdropwort! Let's eat them next time we meet, dad. Also note ...
276 views

### The cryptic treasure hunt

I created this puzzle. This may be really challenging. But I assure you that there is a solid logic behind. (Note: Questions are cryptic) 1: Ucbemfol.jcancyf 2: Mwamebyr;assdpwhbporcrof; File 3: ...
206 views

### The obscure message

I created this puzzle. Find the message. q螣 s䈚 q蟝 v쀎 q蟾 q蠸 q襪 q褰 q弧 q螣 q襪 q蛡 q袈 q蟝 Hint 1: Hint 2: My other puzzles can be found here.
If: $23×3=76$ $13×3=26$ $3×3=9$ $33×3=70$ Find $43×3=?$